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RE: That link to the XOs ...

Posted by Satie (A) on August 13, 2016 at 06:46:56

In Reply to: RE: That link to the XOs ... posted by Skeepowder on August 12, 2016 at 16:59:17:

Triamping the 3A requires particular crossover alignment. The stock alignment is not reproducible for triamping with a commercial analog crossover. You would need to either rework the XO into one of the simpler schemes that have been worked out for it for passive line level. Or have a flexible crossover such as the XM44 or the First Watt B4, or one similar to AndyR's custom DIY job. The best choice among these for an experienced DIY electronics builder is the kind of XO AndyR built. But with power supplies and box it adds up.
If you go for the triamping with the simplified mid and tweeter passive line level filters then a 3rd order Ashly or Furman piece will provide you with a good bass low pass filter.

If you go for reproducing the mid tweeter XO in the original slopes and elbow frequencies then you would need a real active stage for that since they are 2nd and 3rd order and not textbook slopes. You can get that done with a multichannel 5.1 AV pre processor as Computerman did on this forum. That would provide all the gain channels you need and buffering and individual channel level adjustments. With that basic component you can do any crossover alignment up to 2nd order with passive components.

But the complexity gets really bad. So my suggestion is to wait till you have the budget for a First Watt B4 crossover (it is 2 way) and add the 3rd order commercial piece for bass LP and that would allow you to triamp precisely as you can. But that will definitely blow up your budget.

For the passive 1st order mid tweeter section in passive line level, Davey from the UK has worked out a crossover alignment that can be implemented easily with just the commercial 3rd order for bass LP and passive components.

The DSP crossover option - like minidsp is an order of magnitude more flexible and has room correction options. If you are playing predominantly digital sources then you have nothing to lose using the DSP. if you have the budget then a DEQX unit would be the way to go.

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